Question
$27-[13+\{4-(8+4-\overline{1+3}\}]$
✓
Answer
$\begin{aligned} & 27-[13+\{4-(8+4-\overline{1+3}\}] \\ & =27-[13+\{4-(8+4-4)\}] \\ & =27-[13+\{4-8\}] \\ & =27-[13+(-4)] \\ & =21-[9] \\ & =27-9 \\ & =18\end{aligned}$
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